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  2. Buoy - Wikipedia

    en.wikipedia.org/wiki/Buoy

    This had the same conical section below the waterline as the tonne buoy, but at the waterline a barrel shape was used to allow a truncated cone to be above the water. The whole was completed with a top mark. [6] In the nineteenth century iron buoys became available.

  3. Buoyancy - Wikipedia

    en.wikipedia.org/wiki/Buoyancy

    Buoyancy (/ ˈ b ɔɪ ən s i, ˈ b uː j ən s i /), [1] [2] or upthrust is a net upward force exerted by a fluid that opposes the weight of a partially or fully immersed object. In a column of fluid, pressure increases with depth as a result of the weight of the overlying fluid.

  4. Archimedes' principle - Wikipedia

    en.wikipedia.org/wiki/Archimedes'_principle

    In other words, for an object floating on a liquid surface (like a boat) or floating submerged in a fluid (like a submarine in water or dirigible in air) the weight of the displaced liquid equals the weight of the object. Thus, only in the special case of floating does the buoyant force acting on an object equal the objects weight.

  5. Lifebuoy - Wikipedia

    en.wikipedia.org/wiki/Lifebuoy

    Lifebuoy with emergency light on a cruise ship A lifebuoy floating on water. A lifebuoy or life ring, among many other names (see § Other names), is a life-saving buoy designed to be thrown to a person in water to provide buoyancy and prevent drowning. [1] Some modern lifebuoys are fitted with one or more seawater-activated lights to aid ...

  6. Electric ‘seagliders’ that skim over water could make ferries ...

    www.aol.com/electric-seagliders-skim-over-water...

    Just like a boat, a seaglider initially floats, then as it picks up speed it foils — gliding over the surface of the water using wing-like structures called hydrofoils, which retract as the ...

  7. Neutral buoyancy - Wikipedia

    en.wikipedia.org/wiki/Neutral_buoyancy

    In his research, Archimedes discovered that an object is buoyed up by a force equal to the weight of the water displaced by the object. In other words, an inflatable boat that displaces 100 pounds (45 kilograms) of water is supported by the same amount of force. An object that floats in a fluid is known as being positively buoyant.

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